[dpdk-dev] [PATCH] i40e: unintended sign extension

[Slawomir Mrozowicz]

Suspicious implicit sign extension: pf->fdir.match_counter_index
with type unsigned short (16 bits, unsigned) is promoted in
pf->fdir.match_counter_index << 20 to type int (32 bits, signed),
then sign-extended to type unsigned long (64 bits, unsigned).
If pf->fdir.match_counter_index << 20 is greater than 0x7FFFFFFF,
the upper bits of the result will all be 1.
To fix the issue set explicit cast uint32_t of pf->fdir.match_counter_index.

Fixes: 05999aab4ca6 ("i40e: add or delete flow director")
Coverity ID 13315

Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz at intel.com>
---
 drivers/net/i40e/i40e_fdir.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_fdir.c b/drivers/net/i40e/i40e_fdir.c
index 8aa41e5..66ef83f 100644
--- a/drivers/net/i40e/i40e_fdir.c
+++ b/drivers/net/i40e/i40e_fdir.c
@@ -1141,7 +1141,8 @@ i40e_fdir_filter_programming(struct i40e_pf *pf,
 	fdirdp->dtype_cmd_cntindex |=
 			rte_cpu_to_le_32(I40E_TXD_FLTR_QW1_CNT_ENA_MASK);
 	fdirdp->dtype_cmd_cntindex |=
-			rte_cpu_to_le_32((pf->fdir.match_counter_index <<
+			rte_cpu_to_le_32(
+			((uint32_t)pf->fdir.match_counter_index <<
 			I40E_TXD_FLTR_QW1_CNTINDEX_SHIFT) &
 			I40E_TXD_FLTR_QW1_CNTINDEX_MASK);
 
-- 
1.9.1